A kind of retarding type water reducing agent for phosphorus construction gypsum and its preparation method

A technology of phosphorus gypsum and water reducing agent is applied in the field of retarding water reducing agent and its preparation, which can solve the problems of strength loss of gypsum products, solidification and hardening speed block, loss of fluidity, etc., and achieves low cost and enhanced electronegativity. good dispersion effect

Active Publication Date: 2021-11-09
CHINA WEST CONSTR ACAD OF BUILDING MATERIALS CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the setting and hardening speed of phosphorus building gypsum is very fast, and the setting time is only a few minutes (initial setting) to ten minutes (final setting). After adding water and mixing, it quickly loses its fluidity and cannot meet the requirements of normal construction. Adding retarding water reducer to adjust the setting time, so that the gypsum slurry can maintain plasticity for a long time, so as to meet the construction requirements
At present, the commonly used construction gypsum retarding water reducer is organic acid and soluble salt, the dosage is small, and the retarding effect is good, but this kind of retarding water reducer will cause serious loss of strength of gypsum products, so it is limited to a certain extent. The popularization and application of gypsum building materials

Method used

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  • A kind of retarding type water reducing agent for phosphorus construction gypsum and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method for preparing retarded water reducer, the steps are as follows:

[0027] S1. Preparation of polycarboxylic acid-based mother liquor: S11. Polycarboxylic acid-based mother liquor is made of the following raw material components in mass percentage: 40% unsaturated polyoxyethylene ether, 8% unsaturated acid, 1% chain transfer agent, initiator 0.2%, alkali 0.8%, and the rest is water; S12, add unsaturated polyoxyethylene ether and water into the reaction kettle, stir until dissolved; after stirring evenly, heat up to 50-60°C, then add water and chain transfer agent in sequence , unsaturated acid and initiator, keep the temperature constant, after the feeding is complete, keep warm and continue to react for 2 to 3 hours, neutralize with alkali solution until the pH is 7 to 9, and obtain the mother liquor of polycarboxylate superplasticizer.

[0028] S2. Preparation of fiber nanospheres: S21. Add cellulose fibers to lye solution with a concentration of 2 ...

Embodiment 2

[0031] A retarder-type water reducer for phospho-building gypsum, which consists of the following components by weight: 95 parts of polycarboxylic acid-based mother liquor, 14 parts of borax, 0.4 parts of retarder, and 0.5 parts of hydroxypropyl methyl cellulose ether, 0.09 parts of cellulose nanospheres, 0.6 parts of polysiloxane and 95 parts of water.

[0032] The preparation method is the same as in Example 1, and the water reducer product B is obtained.

Embodiment 3

[0034] A retarding water reducer for phospho-building gypsum, which consists of the following components by weight: 100 parts of self-made melamine-based mother liquor, 16 parts of borax, 0.6 parts of retarder, and 0.3 parts of hydroxypropyl methyl cellulose ether, 0.15 parts of cellulose nanospheres, 0.8 parts of polysiloxane and 100 parts of water. The preparation method of cellulose nanospheres is the same as that in Example 1. Add borax, retarder, hydroxypropyl methylcellulose ether, polysiloxane, and cellulose nanospheres to the melamine-based mother liquor in sequence, and stir evenly to obtain the water reducer product C.

[0035] 2. Retarding time and strength test

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Abstract

The invention relates to a slow-setting water reducer for phosphorus building gypsum and a preparation method thereof, which is composed of the following ingredients in proportions by weight: 90-100 parts of polycarboxylic acid-based mother liquor or melamine-based mother liquor, 9-20 parts of borax , 0.2-1.0 parts of retarder, 0-1.5 parts of cellulose ether, 0.1-0.2 parts of suspension stabilizer, 0.1-1 part of defoamer and 90-100 parts of water. The preparation method of the water reducing agent is as follows: S1, prepare polycarboxylic acid-based mother liquor or melamine-based mother liquor; S2, prepare cellulose nanospheres; S3, then add borax and retarder to polycarboxylic acid-based mother liquor or melamine-based mother liquor in sequence , cellulose ether, defoamer, suspension stabilizer, and stir evenly to obtain the target water reducer. The water reducing agent of the present invention has the multiple effects of retarding, reducing water consumption and water resistance, with less added amount, remarkable effect and low cost, and can be used in phosphorus building gypsum powder and other industrial by-product building gypsum powder.

Description

technical field [0001] The invention relates to a retarding water reducer for phosphorus building gypsum and a preparation method thereof, belonging to the technical field of building materials. Background technique [0002] Phosphogypsum is an industrial waste residue produced in the process of wet-process phosphoric acid production, and about 4-5 tons of phosphogypsum are discharged for every ton of phosphoric acid produced. At present, the preparation of phosphogypsum into phosphogypsum by modification treatment and other gypsum products has become an effective way for phosphogypsum resource treatment and disposal. However, the setting and hardening speed of phosphorus building gypsum is very fast, and the setting time is only a few minutes (initial setting) to ten minutes (final setting). After adding water and mixing, it quickly loses its fluidity and cannot meet the requirements of normal construction. The setting time is adjusted by adding retarding water reducing ag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/42C04B103/30C04B103/22
CPCC04B40/0039C04B2103/22C04B2103/302C04B22/0013C04B24/28C04B24/383C04B24/42C04B24/06C04B24/32
Inventor 麻鹏飞程宝军李爽肖潇沈锐周建伟赵世豪高育欣杨文王军
Owner CHINA WEST CONSTR ACAD OF BUILDING MATERIALS CO LTD
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